Built-up roof



A. WINDING BUILT -UP ROOF Dec. 12, 1` 944.

Filed June '7, 1945 OEIMN www@ w .n 0 n mu Patented Dec. 12, 1944 UNITEDSTATES PATENT OFFICE `2,365,19 BUILT-UP ROOF Y Arthur Winding,Milwaukee, Wis. Application June 7, 1943, Serial No. 489,899 4 o1aims.(c1. 10s- 26) for the joint between roof and vertical members.

One of the objects yof the invention is to create a flashing which willnot warp and null away from the Vertical members under the iniiuence ofclimatic conditions.

-Another object of the invention is to create a flashing which will beweatherproof without requiring 'the addition of counterfiashing.

A still further object of the invention is to form a weatherproofflashing wthoutthe aid of nailing strips, prepared flashing bricks,raggle blocks, and metal flashing forms inserted "in the verticalmembers.

The foregoing 'objects are accomplished by bonding to the verticalmember (to a height just above the top of the vertical leg of the cantstrip specified) a single sheet of heavy rooiing felt.

This sheet has an upper portion, which is not at-` tached to thevertical member, of sufficientv size to permit such portion to be foldeddownwardly over and completely cover the sloping leg of the speciedcan't strip. The specied cant strip is then fixed in place so that itsvertical surface presses against the sheet of felt. Built-up roofingmaterials are now applied. These comprise successive layers of asphaltand felt. Such layers have portions extending up on and substantiallycovering the sloping surface of the cant strip. The upper portion of thesheet of roofing felt is folded down lover the cant strip andthe roofingmaterial and bonded to such material. A final layer of asphalt is thenapplied to the outer sury face of such `folded over portion. To effect acomplete seal a bead of plastic roofing cement is placed in the jointbetween the wall and the fold line of the sheet of felt.

With flashing thus constructed, the cant strip not only helps hold theflashing in place, but it protects it from the bad eiects of climaticconn ditions. The bond between the dashing and the vertical member is,therefore, maintained intact and waterproof `for long periods. Thetendency of the flashing to warp and pull away from the vertical memberis eliminated. Because of the double action of the adhesive force of theroofing cement and the pressure of the cant strip, the seal betweendashing and vertical member is main tained `sufliciently tight anddurable to eliminate the necessity of added protection derived fromco-unterashing. The pressure exerted by the cant strip maintains thedashing against the vertical member and hence there is no need ofnailingstrips, flashing bricks, raggleblocks, and metal flashing forms in suchvertical member.

The novel features, which are considered characteristic of theinvention, are set forth with pare ticularity in the appended claims.The invention itself, however, both as to its organization and itsmethod of operation, together with additional objects and advantagesthereof, will best be understood from the following description of aspecific embodiment when read in connection with the accompanyingdrawing, in which:

Figure 1 is a sectional view through the joint between the roofingsupport and a vertical wall showing the improved flashing;

Figure 2 is a fragmentary, greatly enlarged sectional view taken on theline 2 2 of Figure l;

Figure 3 is a fragmentary, greatly enlarged sectional View taken on theline 3-3 of Figure 1.

Referring in greater detail to the drawing, the support for the deck 3is provided by beams I. The end of the beams 'l may be supportedI in thevertical concrete wall 2 in the approved manner. Insofar .as thisinvention is concerned, the deck 3 may `comprise lWood sheathing,concrete, tile, or gypsum block. The vertical wall 2 is illustrated asconsisting of concrete; however, it may dashing `is vto apply to theside of the wall '2 an vio also consist of brick or-gypsum bl'ock.

The iirst step in the method of constructing the asphalt primer 4, suchas is commonly used for such purpose. The coating of primer should eX-tend up the surface of the wall to a point above the top of the speciedcant strip 9. Various sizes of cant strips may be specified dependingupon the size of the installation. When the primer has set, a thicklayer '5v of plastic roofing cement is troweled onto the wall 2 over thesurface previously primed. Then a sheet ii of heavy roofing felt ispressed on and into the layer 5 of plastic roofing cement. The sheet Ehas a lower portion which is substantially extensive with the areacovered, and it is this portion which is bonded tothe wall 2 by thecement i5. The sheet 6 also has an upper unattached portion which matrbe folded down about the top of the cant stript onto the sloping surfaceof such cant strip. The area of such upper portion will substantiallycover the sloping surface of the cant strip when so folded. After thesheet 6 has 'been applied, the next step is to put the wo-odencant strip9 in place.

The cant strip 9 is placed with its vertical surface tightly engagingthe layer 6 and its horizontal surface resting upon the deck 3. In theembodiment shown, the cant strip 9 is comprised of wood, and in suchinstance it is rmly pressed against the lower portion of sheet 6 andsecurely nailed in place by nails I Il. The sheet Ii is thus maintainedin a watertight connection with the Wall 2 by the action 0f both thelayer 5 of plastic roofing cement and the wooden cant strip 9. Ininstallations where the deck 3 is comprised of concrete, a concrete cantstrip is used instead of a wooden cant strip. The concrete is laid wetand formed to the same shape as the wooden cant strip. The weight of theconcrete plus its adherence to the surface of the concrete deck will besufficient to hold the cant strip in place with its vertical surfacefirmly engaging the sheet 6. After the cant strip is positioned asdescribed, the next step consists in laying the main roofing material.

Built-up roofs customarily comprise successive layers of asphalt, pitch,or other bituminous bonding material and roofing felt. The initial layerI I of asphalt or bituminous bond is mopped while hot onto the surfaceof the deck 3 and up on the sloping surface of the cant strip 9.Immediately the first layer I2 of roofing felt is pressed on the layerII. The layer I2 also extends up on and substantially co-extensive withthe sloping surface of the cant strip 9. Then a second layer I3 ofasphalt or bituminous bond is similarly mopped in place. On the layer I3is pressed a second layer I4 of roofing felt. It also extends up on andsubstantially co-extensive with the sloping surface of the cant strip 9.In some installations it may be preferable to have one or two moresuccessive layers of bonding material and felt. When the last of thedesired layers of felt is laid, the final layer I5 of asphalt orbituminous material is mopped on. The layer I5 also extends up thesloping side of the cant strip 9. As soon as the layer I 5 is applied onthe sloping side, the upper unattached portion of the sheet 6 is foldeddownwardly about the top of the cant strip 9 and pressed into the layerI5. The outer surface of this folded over portion is then covered with afinal layer I6 of asphalt or bituminous bond. To make certain that nomoisture will seep in between the concrete wall 2 and the sheet 6, thejoint formed between the wall and the fold in the sheet 6 is filled withplastic roofing cement as indicated at I1.

The fiashing thus formed is securely held against the vertical wall 2without the necessity of having in that vertical wall any speciallyprepared flashing bricks, raggle blocks, or metal flashing forms. Thecant strip 9 performs the function heretofore performed by such specialdevices. The cant strip 9 also performs the additional function ofproviding a buffer which absorbs to some extent changes in temperatureand protects the flashing from the direct rays of the specificembodiments of the invention, many modifications thereof are possible.The invention is not to be restricted except so far as is necessitatedby the prior art and the spirit of the appended claims.

I claim:

1. The method of flashing a deck type roof having a coping wall,including adhering the lower portion of a vertical sheet of roofingmaterial to said wall with its upper portion unattached, securing a cantstrip in place so that its vertical side engages the adhered lowerportion of said sheet, applying roofing material on the roof so that itextends up the sloping side of said cant strip, and folding said upperportion down over the sloping side of said cant strip and bonding it tothe roofing material previously applied to said sloping side.

2. A weather-proof covering for the juncture of a roof and a verticalmember comprising, a sheet of vertically extending roofing materialhaving a lower portion and an upper portion, a layer of plastic roofingcement between the vertical member and said lower portion whereby saidlower portion is adhered to said vertical member, a cant strip having avertical surface engaging with said lower portion to maintain the samein close surface-to-surfacel contact with said cement, said cant striphaving a horizontal surface fixedly engaged with the surface of theroof, said cant strip having a sloping surface extending from the roofto the vertical member, a weather-proof built-up roof having thematerials comprising it extending from the surface of the roof up saidsloping surface and substantially covering the same, said upper portionbeing folded about the top of said cant strip and bonded to said roof.and a bead of plastic roofing c ement inserted in the joint between thevertical member and the fold in said sheet.

3. A weather-proof covering for the juncture of a roof and a verticalmember comprising: a sheet of vertically extending roofing materialhaving a lower portion adhered to the vertical member and an unattachedupper portion; a cant strip having a vertical surface engaging with saidlower portion, a horizontal surface secured to the roof, and a slopingsurface; and a layer of roofing material extending from the roof up onsaid sloping surface; said upper portion being folded down over saidcant strip and bonded to said layer on said sloping surface.

4. In a roofing construction, a roof deck and an upstanding marginalwall therefor, a sheet of roofing material having a lower portion and anupper portion, said lower portion being adhered to said upstandingmarginal wall, a rigid member having a surface flatly engaging with saidlower portion of the sheet, means fixedly securing said rigid member topress the lower portion of said sheet against said upstanding wall, anda layer of roofing material on said roof deck having a marginal edgeportion terminating adjacent said marginal wall, the upper portionof-said sheet being folded downwardly of said rigid member into bondedengagement with said layer of roofing material at a point spaced fromsaid marginal edge, with the said rigid member and the said marginaledge enclosed within said fold.

ARTHUR WINDING.

